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svn+ssh://pythondev@svn.python.org/python/trunk ........ r73196 | benjamin.peterson | 2009-06-03 20:40:29 -0500 (Wed, 03 Jun 2009) | 1 line use the offical api ........ r73278 | benjamin.peterson | 2009-06-07 17:33:11 -0500 (Sun, 07 Jun 2009) | 1 line inherit from object ........ r73279 | benjamin.peterson | 2009-06-07 17:35:00 -0500 (Sun, 07 Jun 2009) | 1 line always inherit from an appropiate base class ........ r73280 | benjamin.peterson | 2009-06-07 17:54:35 -0500 (Sun, 07 Jun 2009) | 1 line use booleans for flags ........ r73299 | georg.brandl | 2009-06-08 13:41:36 -0500 (Mon, 08 Jun 2009) | 1 line Typo fix. ........ r73308 | benjamin.peterson | 2009-06-08 17:18:32 -0500 (Mon, 08 Jun 2009) | 1 line remove useless assertion ........ r73312 | benjamin.peterson | 2009-06-08 18:44:13 -0500 (Mon, 08 Jun 2009) | 1 line remove error checks already done in set_context() ........ r73313 | r.david.murray | 2009-06-08 19:44:22 -0500 (Mon, 08 Jun 2009) | 4 lines Issue 2947: document how return code handling translates from os.popen to subprocess. Also fixes reference link in the os.spawn documentation. ........ r73317 | benjamin.peterson | 2009-06-09 12:24:26 -0500 (Tue, 09 Jun 2009) | 1 line make ast.c depend on the grammar ........ r73318 | benjamin.peterson | 2009-06-09 12:29:51 -0500 (Tue, 09 Jun 2009) | 1 line explain why keyword names are not just NAME ........ r73321 | benjamin.peterson | 2009-06-09 16:13:43 -0500 (Tue, 09 Jun 2009) | 1 line update symbol.py from with statement changes ........ r73324 | amaury.forgeotdarc | 2009-06-09 17:53:16 -0500 (Tue, 09 Jun 2009) | 2 lines Avoid invoking the parser/compiler just to test the presence of a function. ........ r73331 | benjamin.peterson | 2009-06-10 08:45:31 -0500 (Wed, 10 Jun 2009) | 1 line fix spelling ........ r73335 | raymond.hettinger | 2009-06-10 11:15:40 -0500 (Wed, 10 Jun 2009) | 1 line Fix signed/unsigned compiler warning. ........ r73340 | amaury.forgeotdarc | 2009-06-10 15:30:19 -0500 (Wed, 10 Jun 2009) | 2 lines Fix a typo spotted by Nick Coghlan. ........ r73363 | benjamin.peterson | 2009-06-11 12:51:17 -0500 (Thu, 11 Jun 2009) | 1 line use multi-with syntax ........
This commit is contained in:
Benjamin Peterson
parent
6520b685fd
commit
87c8d87b91
15 changed files with 118 additions and 73 deletions
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@ -1470,8 +1470,8 @@ written in Python, such as a mail server's external command delivery program.
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(Note that the :mod:`subprocess` module provides more powerful facilities for
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spawning new processes and retrieving their results; using that module is
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preferable to using these functions. Check specially the *Replacing Older
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Functions with the subprocess Module* section in that documentation page.)
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preferable to using these functions. Check especially the
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:ref:`subprocess-replacements` section.)
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If *mode* is :const:`P_NOWAIT`, this function returns the process id of the new
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process; if *mode* is :const:`P_WAIT`, returns the process's exit code if it
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@ -412,8 +412,8 @@ Replacing shell pipeline
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output = p2.communicate()[0]
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Replacing os.system()
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^^^^^^^^^^^^^^^^^^^^^
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Replacing :func:`os.system`
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^^^^^^^^^^^^^^^^^^^^^^^^^^^
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::
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@ -440,8 +440,8 @@ A more realistic example would look like this::
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print("Execution failed:", e, file=sys.stderr)
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Replacing the os.spawn family
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Replacing the :func:`os.spawn <os.spawnl>` family
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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P_NOWAIT example::
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@ -468,17 +468,85 @@ Environment example::
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Popen(["/bin/mycmd", "myarg"], env={"PATH": "/usr/bin"})
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Replacing os.popen
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^^^^^^^^^^^^^^^^^^
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Replacing :func:`os.popen`, :func:`os.popen2`, :func:`os.popen3`
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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::
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pipe = os.popen(cmd, 'r', bufsize)
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(child_stdin, child_stdout) = os.popen2(cmd, mode, bufsize)
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==>
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pipe = Popen(cmd, shell=True, bufsize=bufsize, stdout=PIPE).stdout
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p = Popen(cmd, shell=True, bufsize=bufsize,
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stdin=PIPE, stdout=PIPE, close_fds=True)
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(child_stdin, child_stdout) = (p.stdin, p.stdout)
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::
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pipe = os.popen(cmd, 'w', bufsize)
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(child_stdin,
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child_stdout,
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child_stderr) = os.popen3(cmd, mode, bufsize)
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==>
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pipe = Popen(cmd, shell=True, bufsize=bufsize, stdin=PIPE).stdin
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p = Popen(cmd, shell=True, bufsize=bufsize,
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stdin=PIPE, stdout=PIPE, stderr=PIPE, close_fds=True)
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(child_stdin,
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child_stdout,
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child_stderr) = (p.stdin, p.stdout, p.stderr)
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::
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(child_stdin, child_stdout_and_stderr) = os.popen4(cmd, mode, bufsize)
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==>
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p = Popen(cmd, shell=True, bufsize=bufsize,
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stdin=PIPE, stdout=PIPE, stderr=STDOUT, close_fds=True)
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(child_stdin, child_stdout_and_stderr) = (p.stdin, p.stdout)
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Return code handling translates as follows::
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pipe = os.popen(cmd, 'w')
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...
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rc = pipe.close()
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if rc != None and rc % 256:
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print "There were some errors"
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==>
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process = Popen(cmd, 'w', stdin=PIPE)
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...
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process.stdin.close()
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if process.wait() != 0:
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print "There were some errors"
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Replacing functions from the :mod:`popen2` module
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.. note::
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If the cmd argument to popen2 functions is a string, the command is executed
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through /bin/sh. If it is a list, the command is directly executed.
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::
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(child_stdout, child_stdin) = popen2.popen2("somestring", bufsize, mode)
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==>
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p = Popen(["somestring"], shell=True, bufsize=bufsize,
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stdin=PIPE, stdout=PIPE, close_fds=True)
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(child_stdout, child_stdin) = (p.stdout, p.stdin)
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::
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(child_stdout, child_stdin) = popen2.popen2(["mycmd", "myarg"], bufsize, mode)
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==>
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p = Popen(["mycmd", "myarg"], bufsize=bufsize,
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stdin=PIPE, stdout=PIPE, close_fds=True)
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(child_stdout, child_stdin) = (p.stdout, p.stdin)
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:class:`popen2.Popen3` and :class:`popen2.Popen4` basically work as
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:class:`subprocess.Popen`, except that:
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* :class:`Popen` raises an exception if the execution fails.
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* the *capturestderr* argument is replaced with the *stderr* argument.
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* ``stdin=PIPE`` and ``stdout=PIPE`` must be specified.
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* popen2 closes all file descriptors by default, but you have to specify
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``close_fds=True`` with :class:`Popen`.
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